Drill cutter



Jan. 14, 1936. H. ROGATZ 2,027,700

DRILL CUTTER Filed Dec. 50, 1953 Z SheetS-Sheet 1 IN V EN TOR.

HENRY ROGATZ A TITORNEYS.

' Jan, M, 1936, H GATZ 2;,@27,700

DRILL CUTTER Filed Dec. 50, 1933 2 Sheets-Sheen 2 INVENTOR. HENRY ROGATZA TTORNEYS.

. Patented Jan. 14, 1936 I I UNITED STATES PATIENT OFFICE DRILL CUTTERHenry Rogatz, Sayre, kla., assignor to Phillips Petroleum Company,Bartlesville, 0kla., a corporation of Delaware Application December 30,1933, Serial No. 704,686

15 Claims. (Cl. 255-71) This invention relates to an improved type ofhaving alternating flat edged and sharp edged cutters for roller boringdrills. teeth. It has often been found that in drilling wells, F gu 2 isa portional d View Of the cutter particularly oil and gas wells, manyhard formashown in Figure 1 and ow the longitudinal tions areencountered, such as granite wash and w of fiat d d t et alternating wthe similar hard formations. In rotary drilling oplon itud nal rows fsha p d d t h, all erations, hard formation bits are usually used toiIlg tapered Sidesdrill through hard formations; particularly u e 3 is aec n p V Of a cutie! granite wash, which consists of individual grainshaving all fl edged teeth w tapering id or fragments of granite imbeddedin a solid for- Figure 4 is a Sectional p View Of a cutter 10 mationwhich is not so hard as granite. The having circumferential rows of flatedged teethcustomary type of cutters used in su h drilling alternatingwith circumferential rows of sharp have sharpened wedge shaped teeththat interedged teethw mesh as the cutters rotate, creating a cutting,Figure 5 is a portional SideVieW Of a cutter and to some extent acrushing, effect upon the having all flat edged teeth with taperingsides. formation at the bearing surface of the bit. Fi ure 6 is aportional side view of a cutter I have discovered that cutters, havingflat- Showing circumferential rows of flat edged tened teeth, provide amore efli ieni; crushing teeth alternating with circumferential rows ofaction than cutters having sharpened or wedge Sharp edged teeth, allhaving tapering Sidesshaped teeth. Figure 7 is'a sectional top view of acutter 20 Advantages of this invention over drill cuthaving alternatingflat edged and Sharp d d ters of the conventional type are, longer lifefor teeth with tapering drill bits, faster drilling, fewer replacementsand Figure 3 is a Portiona1 side View of the cutter changes, more sturdyconstruction with less shown in Figure Showing the flat edged teethbreaking of teeth and savings in time ordinarily alternating diagonallywith the, sharp edged 25 consumed in taking outobits 130,138 rebuilt.teeth, ll hayingfiapermg Sides The pri nary object of this invention,which Figure 9 is a view of the cutter'm its position provides cutterswith flat edged teeth, is to effect a a more thorou h crush- Withparticular reference to the drawings. through whichga hole s g gg g gfii wherein like reference characters indicate corre- 30 th spendingparts, the letter X designates a portion Al ough the teeth of thecutters described m of the I 1 of a 1 1] cutter, and Figure 1 shows thiswedg mr d l ii e r 'ifzl' d iil io ii i z c g a topview the Portion Xhowing the arrangement thereon of alternating flat and sharp prisescutters having all teeth with flattened 3 points and having taperedsides to r t I edged teeth spaced apart so as to permit mter- .5.) gm; peven meshing with other cutters. Another view of In the event formationsare encountered that 222: itfi g g gifi g ggi g- :2 jfi tfi fm requiremore cutting than crushing action the 4 pering sides of the teeth andspaces C into which more sluitablie type of cutters would be thosehavthe other cuttells fit and mt esh as the cut- 40 mg a erna ing wedgeshaped and flattened teeth. The alternating type of cutters would be 2 55: @5 5: i s: $2 1; ggg t itfi ifioilgitfi I partimlarlyv wen adaptedfor use in arming dinal rows alternating with sharp edged teeth througha solid hard formation, the knife edged in longitudinal rows The cutter.shown in Wedge Shaped teeth functimingim cut ure 4 and Figure 6 showsfiat edged teeth A in break up the formation andflthe blunt flat edgedcircumferential rows alternating with sharp tfi ttetirttttiifutitilttfittvt edged teeth B 5 gg g g g g g+ n ta 1" sies. ecu rsownin e The foregoing objects of this inventionwill be a ind l 'ig u re5 shows all flat edged teeth with further described in detail and thenovel feat ering sides. The cutter shown in Figure 7. 50 tures thereofdisclosed more fully as the descripand Figure 8 shows flat edged teethalternating tion proceeds, with the aid of the accompanyin diagonallywith sharp edged teeth with spaces 0 gw e nd pp nded cl imsinto whichthe corresponding teeth of other cute erring now to the drawings: tersfit as the cutters rotate. v p Figure 1 is a Sectional top view f acutter As an example to show the application of my new type of cuttersto the drilling of a granite wash formation, the drill bit is utilized,as shown in Figure 9 of the drawings, which is a conventional type ofrotary drill bit. For drilling through'such a formation, cutters, asshown in Figure 3 and Figure 5 on which are mounted flat edged teeth A,are attached to the bit in the conventional manner. I have found thatdrilling, through this type of formation is greatly expedited by anaction which crushes the hard granite surfaces rather than by an actionwhich attempts to out such hard surfaces, since it has been foundheretofore that cutters having sharp edged teeth are quickly destroyed.

found that sharp edged cutters must be replaced or rebuilt about everyfive'feet whereas the fiat edged teeth of my invention insures a moreefiicient crushing action and may be used in drilling from 10 to 15 feetwithout replacement. Likewise, in drilling with cutters having sharp"edged teeth, it requires about 12 hours to drill v 8 feet; whereas, bythe use of my cutters having flat teeth, only 12 hours are required todrill 2'5'from 16 to 24 feet.

In formations of varying hardness it may be found preferable to employ abit having several cones, one or more of whichmay have mounted thereoncutting teeth with wedge shaped edges,

39 the others having mounted thereon cutting teeth with flat surfaces orany combination of ar-' rangement of teeth described above.

' I do not desire to be limited by'the shape or size of teeth in mycutters norto the shape or size of cutters except insofar as I may belimited by the scope of the appended claims.

Having thus described my invention, 'what I claim is: v V v1.,Afrusto-conical drilling tool having a cone 40 shaped. cutting areaprovided with a plurality of axially aligned rows of cutting teethalternate teeth having cutting surfaces terminating in. either a flattop grinding surface or a'sharp top-cutting edge,'. and "a plurality ofaxially ,45 aligned non-cutting surfaces disposed upon said cone betweenthe rows of said cutting'teeth.

. 2. Afrustoconically shaped drilling tool hav- .ing a cone shapedeutting ar'ea, a plurality of A.frusto conicafdrilling toolfhaving-acone r 52. shaped cutting area provided; with "a plurality ofaxially'aligned"rowslofrfcutting te'et h. alternate..,teeth havingcutting surfaces terminating one between' theflrowsofxsaid'cutting ed'larea-' -providedwwith a plurality of ax"- ally aligned rows of,.,cutting teeth}: alternate eethrhav ing-xfiutting surfaces terminatingin'a harp top cuttingqedge, and'a' plurality'ofaxially lignednon-cutting surfaces disposed upon said cone between. the rows of saidcutting teeth.

shaped cutting area provided ,with a plurality -of;"circumferentially-aligned rows ofcutting teeth, alternate teeth having cutting surfacesterminating in either aflat top grinding sur- In actual experience ithas been I ,1.l ationwithrespectto .said first teeth mentioned. i

-.in; 'a fiat-top grinding surface, and a plurality of axiallyalignednomcutting'surfaces ;disposed M v z having'acone shaped cuttingarea, rusto-jconical drillingtjoolhaving 'a' cone, v e e H I I natinginflat top cuttingsurf fes a p :..5. 7A frusto-conicaldrilling tool havinga cone.

surfaces disposed upon said cone between the rows of said cutting teeth.1

6. A frusto-conical drilling tool having a cone shaped cutting areaprovided with a plurality of axially aligned rows of cutting teeth,alternate teeth having cutting surfaces terminating in either a flat topgrinding surface or a. sharp top cutting edge, and a plurality ofcircumferentially aligned non-cutting surfaces disposed upon said conebetween the rows of cutting teeth.

7. A frusto-conical drilling tool having a cone shaped cutting areaprovided with a plurality of axially aligned rows of cutting teeth,alternate teeth having cutting surfaces terminating in a flat topgrinding surface, and a plurality of circumferentially alignednon-cutting surfaces disposed upon said cone between the rows of saidcutting teeth.

8. A frusto-conical drilling tool having a cone shaped area providedwith a plurality of axially.

aligned rows of cutting teeth, alternate teeth having cutting surfacesterminating in .a, sharp and teeth terminating in sharp cutting edges.

' 10. A frusto-coni cally shaped drilling tool having a cone shapedcutting area, a plurality of cutting teeth mounted on said areaterminating in flat top cutting surfaces, and a plurality. of additionalteeth terminating in sharp cuttingedges arranged upon said cone inalignment with respect tosaid first mentioned teeth.

'11. A f-rusto-conically shaped drilling tool having a cone shapedcutting area, :ax'plurality of outin teeth mounted on'saidareatermfiting in flat top .cuttingsurfaces, ,and a; plurality of additionalteeth terininating, in sharp cutting edges arranged upon said cone inspaced relation with respect to' said first mentioned'teeth' andseparated therefrom by a plurality; or axially ne n -entr e sur a edigitised be ee said teeth,

having j a Lconefg'shape'd cutting, rea, a plurality of cuttingyteethmounted onjsaid area; terminat ing mifl t t s ing. g f a ri a u al ty ofadditional,Iteethfterminated.in sharp cutting edges arr n ed 'uri 'n.said'qo in. attest-reation' withfrespect to; said first; mentionedteeth and separated therefrom by H a plurality of circumferentiallyaligned nonfcutting: s' faces: disqs etw ea d s ha.

13.;A frustoacbniically "sha have. l ra ity ea I termiof cutting? teethineunted. on' said ledges, arrang d upon s a'id lcone, 1n"a'.lternate"relation "with; respect) to I said first mentioned teeth, andaxiallyiandj .ircumferentiallyaligned non-cutting areas disposed betweenthe said teeth terminating in flat top. cutting surfaces and the'said'teeth terminating in's'harp cutting edges." p

14. A frusto-conically shaped drilling tool having a cone shaped cuttingarea,' a' plurality of cutting teeth mounted on 'said area terminatingin flat top cutting-surfaces, a plurality of additional teethterminating in sharp cutting edges arranged upon said cone in alternaterelationwith respect to said first mentioned teeth, and axially alignednon-cutting areas disposed between the said teeth terminating in flattop cutting surfaces and the said teeth terminating in sharp cuttingedges.

15. A frusto-conically shaped drilling tool having a cone shaped cuttingarea, a plurality of 10 cutting teeth mounted on said area terminatingin flat top cutting surfaces, a plurality of additional teethterminating in sharp cutting edges arranged upon said cone in alternaterelation with respect to said first mentioned teeth, andcircumferentially aligned non-cutting areas disposed between the saidteeth terminating in flat top cutting surfaces and the said teethterminating in sharp cutting edges.

